Not that I have an answer but it's so nice to see someone who utilizes transparency maps! Many people would have modeled the scallops and added a lot of unnecessary polygons to the model :) I like low poly things! And so does Poser :)

I hope the shadow bias is the answer to the problem!

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You just can't put the words "Poserites" and "happy" in the same sentence - didn't you know that? LaurieA
  Using Poser since 2002. Currently at Version 11.1 - Win 10.